[1.6 FSI] Misfiring after warming up

[VETRA]

 

Hello everybody!

 

I am new to this forum and what brought me here is, as it often happens, a big problem that I can't figure out myself...

My lovely A2 1.6 FSI, which I own for less than a year started misfiring about 6 months ago. It started as barely noticeable and gradually it's getting worse and worse...

 

The engine works perfectly for 3-5 minutes after cold start.

Then after a little warming up (say, 3-5 km travelled): 

   Works ok at ide.

   Works ok (ish) at revs >4000 RPM.

   Noticeably misfires at RPMs around 2000-2500, especially around 50% throttle.

 

Check engine blinks then light up. Here are the errors I am getting all the time: 

 

Control Module Part Number: 036 906 013 F

Component and/or Version: MED7.5.11 4628

Software Coding: 00051

Work Shop Code: WSC 02138

Additional Info: WAUZZZ8Z53N005638 AUZ7Z0B2098087

VCID: 122DCA0A5E18EB8E3D9-5000

6 Faults Found:

 

17443 - Sensor for NOx (G295)

P1035 - 35-10 - Signal Implausible - Intermittent

16523 - Oxygen (Lambda) Sensor B1 S2

P0139 - 35-00 - Response too Slow

17584 - Bank1: O2 (Lambda) Correction Behind Catalyst

P1176 - 35-00 - Control Limit Reached

16684 - Random/Multiple Cylinder Misfire Detected

P0300 - 35-10 - - Intermittent

16685 - Cylinder 1

P0301 - 35-10 - Misfire Detected - Intermittent

16687 - Cylinder 3

P0303 - 35-10 - Misfire Detected - Intermittent

 

Misfiring cylinders are randomly different every time.

 

What I did so far:

Fuel system:

-          Replaced fuel filler cap – no effect

-          Replaced fuel filter – no effect

-          Replaced fuel pressure regulator – no effect

-          Replaced Activated charcoal canister – no effect

-          Replaced N80 solenoid valve – no effect

-          Used injector cleaning fuel additives several times – sometimes they seemed to have helped a little, maybe…

Ignition:

-          Replaced spark plugs – this probably helped a little

-          Replaced ignition coils – this helped a lot but didn’t solve the problem

Engine mechanics:

-          Checked compression
I did this in a garage – I don’t remember the numbers, but the guys said all cylinders are even and the values are good.

-          Cleaned up the grounding point behind the left headlight – didn’t do much.

 

Now I’m puzzled where to look next.

I attach also here a few logs.

Any advice will be highly appreciated! 

 

 

 

LOG-01-007-140-142.csv LOG-01-007-140-142 1.csv LOG-01-007-140-142 2.csv LOG-01-007-140-142 3.csv

[HellSoldier]

Hey Vetra,

 

just a few Tipps that i discoverd while having my 1.6FSI.

 

The Software from ProBoost did a LOT of a diffrence to the car. Highly recommended!

 

There are 2 diffrent Types of Misfires (at least in German).

 

One Type is caused by the Spartplugs and Coils. 

 

One is caused by coked injectors.

 

Since you have allready change the Plugs and Coils i would suggest to clean the Injectors.

 

Maybe try UMS -> https://ultimatesolutions.de/produkt/einspritzduesen-reinigung-service/#

 

I think they will help you out too, even when you are from France.

 

The Injectors have to be removed and send to them for cleaning and testing.

 

Good Luck!

 

greetz

Marius

 

[VETRA]

Thank you Marius!!

I spoke with my garage guys - they said they are quite afraid of the amount of labour for taking out the injectors... but it looks like this is the way to go...

(I live in a tiny village.........)

I'll study a bit - maybe I could try to do it myself...

 

Thanks again!

Cheers

Vitaly